Question

PLEASE HURRY THIS IS TIMED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

How many moles are equivalent to 2.50x1020 atoms of Fe?
a. 4.15x104 mol Fe
C. 41500 mol Fe
b. 4.5x104 mol Fe
d. .00000415 mol Fe

Answer 1

a. 4.15x10⁻⁴moles Fe

Step-by-step explanation:

1 mole of a substance is defined as 6.022x10²³ particles of this substance. That means:

1mol of electrons = 6.022x10²³electrons

1mol of atoms = 6.022x10²³atoms

1 mol of molecules = 6.022x10²³ molecules

And 1mol of atoms of Fe = 6.022x10²³ atoms of Fe

That means 2.50x10²⁰ atoms of Fe

2.50x10²⁰ atoms Fe * (1 mole of Fe / 6.022x10²³ atoms) =

4.15x10⁻⁴ moles of Fe

Right answer is:

a. 4.15x10⁻⁴moles Fe